Al(2)O(3)-coated Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) nanotubes as cathode materials for high-performance lithium-ion batteries.
Al(2)O(3)-coated Li(1.2)Mn(0.54)Ni(0.13)Co(0.13)O(2) nanotubes as cathode materials for high-performance lithium-ion batteries.
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Al2O3包覆Li1.2Mn0.54Ni0.13Co0.13O2纳米管作为高性能锂离子电池正极材料
DOI：
10.1039/c8ra09428d
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发表时间：
2019-01-14
期刊：
影响因子：
3.9
通讯作者：
Zhang, Liwei
中科院分区：
文献类型：
--
作者：
Chen, Yangwen;Wang, Xinchang;Zhang, Jiajia;Chen, Baiyuan;Xu, Junmin;Zhang, Sen;Zhang, Liwei
采用静电纺丝法制备了富锂锰基层状正极材料Li1. 2Mn0. 54Ni0. 13Co0. 13O2（LMNCO）纳米管，并在其表面包覆了不同量的非晶态Al2O3。系统研究了Al2O3包覆量对LMNCO纳米管结构和电化学性能的影响。结果表明，表面包覆Al2O3后，样品的形貌和结构没有明显变化。电化学测试表明，Al2O3包覆的LMNCO纳米管具有明显的电化学性能增强。经表面改性的LMNCO纳米管的初始库仑效率从74.9%提高到85.2%，在1C下90次循环后容量保持率高达97.6%。包覆样品的电化学性能的提高归因于均匀的Al2O3包覆层和尖晶石界面层中的三维Li+扩散通道的保护作用。
Li-rich manganese-based layered cathode Li1.2Mn0.54Ni0.13Co0.13O2 (LMNCO) nanotubes are synthesized by electrospinning and surface coated with different amounts of amorphous Al2O3. The effects of the coating content of Al2O3 on the structural and electrochemical performances of LMNCO nanotubes are investigated systematically. The results show that the morphologies and structures of the samples exhibit no apparent changes after being coated with Al2O3. Electrochemical tests indicate that the Al2O3-coated LMNCO nanotubes exhibit obviously enhanced electrochemical performances. The initial coulombic efficiency of surface modified LMNCO nanotubes increased from 74.9% to 85.2%, and the modified LMNCO nanotubes have a high capacity retention of 97.6% after 90 cycles at 1C. The improved electrochemical performances of the coated samples are attributed to the protective function of the uniform Al2O3 coating and the three-dimensional Li+ diffusion channel in the spinel interface layer.
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